<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>页面结构分析</title>
</head>
<body>
    <header>
        <h2>网页头部</h2>
    </header>

    <section>
        <h2>网页主体</h2>
    </section>

    <footer>
        <h2>网页脚部</h2>
    </footer>

    <nav>导航</nav>
</body>
</html>